[PATCH v1 15/17] pinctrl: cy8c95x0: Override IRQ for one of the expanders on Galileo Gen 1

Andy Shevchenko
2022-09-02T18:34:57Z

ACPI table on Intel Galileo Gen 1 has wrong pin number for IRQ resource
of the I²C GPIO expander. Since we know what that number is and luckily
have GPIO bases fixed for SoC's controllers, we may use a simple DMI quirk
to match the platform and retrieve GpioInt() pin on it for the expander in
question.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/pinctrl/pinctrl-cy8c95x0.c | 48 ++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-cy8c95x0.c b/drivers/pinctrl/pinctrl-cy8c95x0.c
index 5d8a7d236e62..f38e7dc794e9 100644
--- a/drivers/pinctrl/pinctrl-cy8c95x0.c
+++ b/drivers/pinctrl/pinctrl-cy8c95x0.c
@@ -7,7 +7,9 @@
* Author: Naresh Solanki <Naresh.Solanki@9elements.com>
*/

+#include <linux/acpi.h>
#include <linux/bitmap.h>
+#include <linux/dmi.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
@@ -73,6 +75,46 @@ static const struct of_device_id cy8c95x0_dt_ids[] = {

MODULE_DEVICE_TABLE(of, cy8c95x0_dt_ids);

+static const struct acpi_gpio_params cy8c95x0_irq_gpios = { 0, 0, true };
+
+static const struct acpi_gpio_mapping cy8c95x0_acpi_irq_gpios[] = {
+ { "irq-gpios", &cy8c95x0_irq_gpios, 1, ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER },
+ { }
+};
+
+static int cy8c95x0_acpi_get_irq(struct device *dev)
+{
+ int ret;
+
+ ret = devm_acpi_dev_add_driver_gpios(dev, cy8c95x0_acpi_irq_gpios);
+ if (ret)
+ dev_warn(dev, "can't add GPIO ACPI mapping\n");
+
+ ret = acpi_dev_gpio_irq_get_by(ACPI_COMPANION(dev), "irq-gpios", 0);
+ if (ret < 0)
+ return ret;
+
+ dev_info(dev, "ACPI interrupt quirk (IRQ %d)\n", ret);
+ return ret;
+}
+
+static const struct dmi_system_id cy8c95x0_dmi_acpi_irq_info[] = {
+ {
+ /*
+ * On Intel Galileo Gen 1 board the IRQ pin is provided
+ * as an absolute number instead of being relative.
+ * Since first controller (gpio-sch.c) and second
+ * (gpio-dwapb.c) are at the fixed bases, we may safely
+ * refer to the number in the global space to get an IRQ
+ * out of it.
+ */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"),
+ },
+ },
+ {}
+};
+
#define MAX_BANK 8
#define BANK_SZ 8
#define MAX_LINE (MAX_BANK * BANK_SZ)
@@ -1298,6 +1340,12 @@ static int cy8c95x0_probe(struct i2c_client *client)
bitmap_set(chip->shiftmask, 0, 20);
mutex_init(&chip->i2c_lock);

+ if (dmi_first_match(cy8c95x0_dmi_acpi_irq_info)) {
+ ret = cy8c95x0_acpi_get_irq(&client->dev);
+ if (ret > 0)
+ client->irq = ret;
+ }
+
if (client->irq) {
ret = cy8c95x0_irq_setup(chip, client->irq);
if (ret)
--
2.35.1